Real Life:
An "I'll listen to what you say but I'll stay quiet." personality.
An "I don't care whatever the hell is coming out of your mouth so I won't respond." personality.
A "Laugh at every little thing for no apparent reason and run around like a little squirrel." personality.
...or sleeping.

Internet:
"Meow~ I'm a kitty~ Play with me! o.o" character...or "Normal" I guess?

There's also a "Don't talk to me or I'll chew on your arm while you run around screaming in pain." but that's only when i'm really pissed which is very rare.